Series MM Mini-Master® Flowmeter

2" or 1-1/2" Scale, Configurable Valve Option

The SERIES MM Mini-Master® Flowmeters consists of two series of flowmeters
suitable for both gas and liquid applications with advanced features at a low cost.
The Series MMA is a 2" (51 mm) scale flowmeter that is user configurable with or
without non-removable top or bottom front mounted metering valves. It is constructed
from transparent nylon material providing high chemical resistance and is easily
disassembled via the provided key for cleaning or reconfiguration.
The Series MMF is a 1-1/2" (38 mm) scale compact flowmeter ideal for measuring
small volume air. It features bezel type mounting that can be quickly installed from the
front of the instrument panel.

.2-1.2 SCFH Air
.5-2.5 SCFH Air
.5-5 SCFH Air
1-10 SCFH Air
2-20 SCFH Air
5-50 SCFH Air
10-100 SCFH Air
20-200 SCFH Air
30-300 SCFH Air
.1-.5 LPM Air
.2-1.2 LPM Air
.25-2.5 LPM Air
.5-5 LPM Air
1-10 LPM Air
2.5-25 LPM Air
5-50 LPM Air
10-100 LPM Air
15-150 LPM Air
1-8 GPH Water
1-16 GPH Water
4-40 GPH Water
5-60 GPH Water
5-50 cc/min Water
10-150 cc/min Water
20-200 cc/min Water
50-500 cc/min Water
.1-1.1 LPM Water
.25-2.5 LPM Water
.3-3.5 LPM Water

Why are top mounted valves recommended for flowmeters used for vacuum service?

Answer

To maintain atmospheric pressure in the indicating bore and therefore preserve accuracy; an inlet restriction would reduce pressure in the bore. This is essentially the opposite situation to outlet back-pressure in a pressure system which increases pressure in the bore and also affects accuracy. Remember that all standard Dwyer flowmeters are calibrated for standard atmospheric pressure and temperature in the bore.

What factor is used to correct for different flowmeter inlet pressure?

Answer

If the flowmeter is exhausting to atmosphere, no correction factor is needed. If back-pressure is present due to downstream plumbing or restrictions, this error can be corrected utilizing the conversion curves in our full-line catalog or the following equation.

What are wetted materials in following flow meter part numbers? Are they compatible with HCl?
MMF-10-TMV
MMF-10
MMF-2-TMV
MMF-2
Is MMF available in 4or 5 SCFH full scale?
What is ball material for these ranges above?

Answer

The Series MMF flowmeters have the following wetted materials:
Body: Styrene Acrylonitrile
Float: Stainless Steel, Black glass, Nylon
Valve: Polyurethane
For the -2 range, the ball material is 302 stainless steel. For the -10 range, the ball material is nylon. Unfortunately, these materials are not compatible with HCl. Also, the 4 or 5 SCFH range is NOT a standard range for the MMF. The -10 range number would be the logical choice to pick since the 4 or 5 SCFH range would be encompassed.